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Some and SummerThe TOMBOW (acid free) BRUSH PEN is designed to be water active, to bleed and form gradients and be similar in appearance to watercolor or like a solvent pen when desired. Like most of these things the tendency to mobilize with water will likely reduce over time, i.e. days and weeks.I doubt that the oil paint and SDM will mobilize the pigment in the same way (I could be wrong, don't have a pen to try). I suspect that even if it does it will not materially influence the value or pigmentation of the overlying paint.The mfrs webpage is delightfully free of anything technical, however it does warn that the pigments are prone to fading in bright light.Denis